GEOLOGICAL SURVEY OF xkE TEKEITORIES. 



157 



Position. 



Time. 



Ph 



a 



o 



Above Old Faithful 



Belo-n- Old Faithful, opposite Bee-Hive 



Opposite Grand Geyser 



Above Giant 



Below Grotto 



East Fork of Fire-Hole Kiver above its junction with the main river, but 

 below .<*pruigs 



iladison liivel-, just below the junction of east fork of Fire-Hole Eiver 



with the Fire-Hole Paver 



^iladison Eiver about twenty miles, below the junctioii of east fork of Fire- C 



Hole Paver. I 



Madison Paver just after its junction with the Jefferson Eiver, near Gallatin 



City, Montana Territory 



Gallatin Eiver just above the junction with the Missouri Eiver,near Gallatin 



City, Montana Territory 



12. 00 m . . . 

 12. 05 p. m. 

 12. .30p.m. 



1. 50 p. m. 



1. 55 p. m. 



7.30 a.m. 



7.40 a.m. 

 6. 00 p. m. 

 C. 00 a. m. 



7.30 a.m. 



7.30 a.m. 



op. 

 56 

 58 

 56 



58 

 58 



°F. 

 53 

 56 

 60 

 60 

 60 



55 



60.4 



56 



52 



These observations were all made in August, with the exception of 

 the last two, which were made September 10, 1872. 



The following- analyses are of specimens collected by the Snake Eiver 

 division of the expedition : 



Xo. 1. — Geyserite ball from geysers of Shoshone Lake. Compositiou, irregular ; luster, 

 dull; structure, amorx^hous; liardness, 5.5; color, grayish white. 



Analysis. 



Per cent. 



Loss at 110° C ■ 5,75 



Loss on ignition 6. 25 



Sihca .' 85.75 



Alumina and iron 2. 20 



Lime 85 



Magnesia Trace. 



Soda* Trace. 



Potassa"^ Trace. 



Lithia* Trace. 



100. 80 



No. 2.— Bluish-gray geyserite from geysers of Shoshone Lake, 

 ated ; luster, dull ; hardness, 5. 



Amorphous ; lamin- 



Analysis. 



Per cent. 



Loss at 110° C 5.00 



Loss on ignition 8. 00 



Silica 76.80 



Alumina 9. 46 



Iron Trace. 



Lime 1.80 



Magnesia Trace. 



Soda" Trace. 



101. 06 



* By spectroscopic examination. 



